US1334105A - lundell - Google Patents

Description

A. E. LUNDELL.

SWITCH CONTROLLING SYSTEM.

APPLICATION FILED JUNE 21, 1916.

Patented Mar. 16, 1920.

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' A. E. LUNDELL.

SWITCH CONTROLLING SYSTEM.

APPLICATION FILED JUNEZI, 1916.

'1 ,334, 1 O5 Patented Mar. 16, 1920.

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//7 V8/7/0/ A/b en 5. L ands/A burrs? srn'rns EN OFFICE ALBEN' E. LUNDELL, OF NEXV YORK, N. L, ASSIGNOR XVESTERN ELECTRIC COMPANY, INCORPORATED, Q13 NEW YORK, N. 1., A CQR-PORATIEN OF. NEW YORK- swrronpcnrnonmne streamer.

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Specification of Letters Patent. Patented luztl'. 16, 1920.

Applicationfiled Junefll, 1916. Serial No. 105,002.

To all whom it may concern:

Be it known that I, ALBEN E. L'UNDELL, a citizen of the United States, residing at New York, in the county of Bronx and State of New York, have invented certain new and useful Improvements in SwitchControlling Systems, of which the following is a full,

clear, concise, and exact description.

This invention relates to a circuit arrangement for controlling the operation of an automatic switch, and more particularly to a circuit arrangement whereby the speed of a brush-driven shaft is made to take place at a uniform desired rate, under the control of an electromagnetic device.

This invention is specially adapted for use with. a switch of the structure shown in Patent No. 1,217 ,399, granted November 20, 1917, to C. J. Hendrickson. This invention is not, however, restricted to use with this particular structure, but may be used to govern the speed of any desired type-of switch.

' In a switch of the type disclosed in the above mentioned application, motion is applied to a brush shaft through the action of solenoids and plungers. Rotary motion is given to the shaft by the action ofa'toothed rack on a pinion carried by the shaft, the

toothed rack carrying on one end a plunger operated by a solenoid. Vertical motion is obtained by the pull. exerted on a plunger mounted directly on the brush-carrying shaft by a second solenoid.

The principal feature of the invention is the provision of means for placing the driving circuit of the shaft actuating magnet under the control of an electro-magnetic speed-controlling device. 7

In a preferred embodiment of the invention, the arrangement is as follows: at the end of the first half of each step, a slowrelease relay is actuated, and upon the completion of each full. step, the driving circuit maintained open until the relay releases its armature. This necessitates a time interval between successive steps and insures a uniform rate of advancement of the brush shaft.

Referring to the drawings, Figure 1 is a side elevation of a switch suitable for use with this invention; Fig. 2 is a plan view, partly in section, of the same, on the line up type. ate a plunger 2, such plunger carrying a 22of Fig. 1; Fig. 3 is a circuit arrangestrip of toothed rack? This toothed rack is in engagemcntwith a pinion 1 mounted onthe rotatable shaft 5. The action of this solenoid impartsrotary motion to the shaft. Vertical motion isgiven to the shaft bya second solenoid 6, which *is arranged to operate a plunger 7 mounted in the shaft 5.

YA frame 8, pivotally and slidably mounted on studs 9 and 10, carries atone end an armature 11, and at its other end, a pawl 12 which is arranged to engage the teeth of the rack 3 and is normally held from engagement therewith by. the action of a spring 13.

A. similar frame 14: is provided for solenoid 6 and is also pivotally and slidably mounted on studs 15 and 16. This frame carries an armature 17 and a pawl 18, which is arranged to engage notches 19 on the brush shaft. f

Side-switch wipers 20 are arranged to swing over contact sets 21. A ratchet wheel and hinged escapement 23 supply means for electromagnetic control.

Spirally disposed brushes 24 are arranged about the shaft 5, and may be brought into an operative position with relation to their respective groups of terminal sets 25, 26, by the rotation of said shaft.

Circuit controlling means are indicated at 38 and 89. An arm 68, carrying an .antifriction roller 64, is arranged to sucessively I ride over circular teeth. 88, thereby .alternately operating contacts Gland 62 for apurposejto be described later -A magnet 27 controls the release of the entire switch. A pivoted armature lever 28 I I is actuatedwhen magnet 27 is energized,iand

restorestheside switch by engaging 9. lug

29 on the toothed segment-22, the other end of the lever 28 being arranged to engage an offset 30 on aipivoted bell crank lever 31 to withdraw a holding pawl 32 from engagement with the. toothed rack 3. This 6C"; pawl is normally spring-pressed into engagement with the toothed rack by spring The lever 31 in operating carries with it an arm 34 attached to frame 1 L, causing the withdrawal of pawl 18 from a slot 19, the.

brush shaft now being free to return to normal, being restored vertically by the act on of gravity, and in a rotary direction by the retraction of the toothed rack by the action of springs 35 and 36.

The solenoids are made subject to impulse control in the following manner, the con trol mec ianisn'i for the rotary solenoid only being described, since the operation of the vertical controlling means is the same: upon the energization of the solenoid l, the armature 11 is attracted and throws the pawl 12 into engagement" with one or the teeth of the rack the pawl 12 slips into a notch between adjacent teeth oi the rack so that the rack carries with it the bracket 8. The motion of the rack is limited to one step, since. the armature ll acts as a stop when engages the head of solenoid 1. Upon the termination of currentllow through the solenoid, the armature 11 is retracted by the action or" spring 13, thus disengaging the pawl 12 from the toothed rack. The bracket 8 is then returned to its normal position under theinfiuence or a spring 37, the spacing of the teeth on the rack being such that the pawl 12 now lies in the plane of the next tooth and is ready torcngageinent therewith on the next en-ergization of the solenoid 1.

Referring now to the circuit arrangement shown in Fig. 3, a selector circuit is shown, connection being extended thereto from the substation at the left through a line finder fswiteh or similar device whose brush set leaserelay to from tree pole of battery,

Winding ofrelay e2, armature and front contact of relay 41, to ground. ll pulls up and breaks the circuit of release magnet 27, which would otherwise be closed a?- the brush shaft ha s-made its first n10 veinent.

The subscriber now sends a series of impulses to position a brush set below a'sel'ected group of trunks leading toconnectors in. the desired group. Upon each retraction of the armature of relay 4sl,"'a n impulse is sent through rotary solenoid from tree pole of battery, winding of solenoid e 5, sideswitch armsfi and its first contact, armature and front contact of relay l2, armature and line is advanced to a connector '20, through UJOll attraction of nlun er 2 l D 7 l I moves the brush shait a half step, at which after-a time, deenergized. The retracion of the armature of relay i l opens the circuit of magnet 51, which deenergizes and releases the side-switch arms into their sec end position.

in the second position 0 t the side switch, current is led to the 've' solenoid 52 through free pole of battery, winding of soleso noid 52, side-switch arm and its second contact, armature and back contact or" slowrelease relay contacts 62 and 39, to wound. The solenoid is energized and time the roller i'des up on one of the teeth 3-8, breaking the circuit of solenoid 52 and completing t 1e circuit for relay 53 from tree pole of batery, and contacts 61 and 39,

to ground. le a 53 at once is energized and tric circui oil 1 pleted from grounded battery, winding of solenoid sideswitch arm 50 and its second contact, armature and front contact of relay 53, and con ts 61 and 39, d. The shat; is moved aha at which time the roller 6% drops into one of the notches 65, thereby opening the circuits 1 52 and relay Relay alter of solenoid a lapse of time releases its armature, again completing the circuit of solenoid 52 over the path first described. This mode of operation c ntinues until a brush set 60 fi -ds the terinii i ls of an idle trunk, the time interval required. after each step for the release of 10 rel preventing the shai't from operating at undesirable speed.

The ese no gized in switch b:

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bridges the s1 tains circuit through ground. Ti licn the t. is encounter de ergized d releas third position. switc the solenoul 52 is opened, and the sub. back contact of relay ll, to ground, In pa ill tun into nro F lcnit or the must cat s mien to sc for, a slow-release relay conta -t sirings operated in accordencen' h the successive secondary po I i shaft. said contact spring shutting the controi of said driv ing' circuit to said slou releas reiay at the conclustion oi the first half of {no.Ch step, the driving circuit being; interrupted at the QUE- pletion o each fuli step until said relay releases its: armature.

12. In a telephone exchange system, incoming lines and outgoing lines a selector switch for interconnei-ting said lines, said switch including a brush-c rrying shaft, a

circuit thercseries of notches on said shaft, a solenoid responsive to impulse control for imparting primary motion to said shaft, a second solenoid for imparting secondary motion to said shaft a driving circuit for said secondary solenoid, a member carrying a roller traveling over said notches on secondary movementof said shaft, contact springs operated by said member, a slow-release relay, said contact springs shifting the control of said driving circuit to said slow-release rela at the completion of the first half of each step, the driving circuit being interrupted at the completion of each full step until said rclay releases its armature.

In Witness whereof I hereunto SHbSCl'lbe ALBEN E. LUNDELL.

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